Asymmetric Freedericksz transitions from symmetric liquid crystal cells doped with harvested ferroelectric nanoparticles

作者：Cook G^*; Reshetnyak V Yu; Ziolo R F; Basun S A; Banerjee P P; Evans D R

来源：Optics Express, 2010, 18(16): 17339-17345.

DOI：10.1364/OE.18.017339

The electrical Freedericksz transition characteristics of planar aligned liquid crystal cells doped with harvested single ferroelectric domain 9 nm nanoparticles of BaTiO3 have been measured. We demonstrate for the first time that the electrical pre-history of the cells imparts significant polarity sensitivity to the Freedericksz characteristics. The presence of harvested single domain ferroelectric nanoparticles enables cells to be programmably semi-permanently polarized. This reduces or increases the Freedericksz transition threshold by 0.8 V, depending on the polarity of the applied voltage, giving a net 1.6 V Freedericksz threshold asymmetry for 8 mu m thick cells filled with TL205 liquid crystal.

• 出版日期2010-8-2